Language

Can I activate two different versions of Unity on the same machine with one licence?,Can I activate two different versions of Unity on the same machine with one license?

I have to two different version of unity. (5.x and 2017) but I have only one license of 2017. Can I activate these two different versions of Unity on the same machine with one licence?,I have to use 2 version of unity. (5.x , 2017) but I have only one license. (2017) Can I activate two different versions of Unity on the same machine with one license?